python: use Python Environment Tools for interpreter discovery #1268

Job	Run time
Python Tests (ubuntu-latest, 3.8)	1m 42s
Python Tests (ubuntu-latest, 3.12)	1m 41s
Check Python types	3m 4s
Lint	1m 36s
Test Positron IPyKernel (macos-latest, 3.9)	2m 8s
Test Minimum Positron IPyKernel Dependencies (ubuntu-latest, 3.8)	6m 57s
Test Positron IPyKernel (windows-latest, 3.10)	7m 46s
Test Positron IPyKernel (ubuntu-latest, 3.11)	2m 42s
Test Positron IPyKernel (ubuntu-latest, 3.12)	3m 8s
Create VSIX (ubuntu-latest, x86_64-unknown-linux-musl, linux-x64)	4m 38s
Native Tests (ubuntu-latest)	38s
Native Tests (windows-latest)	1m 27s
Test TypeScript (ubuntu-latest, 3.x, ts-unit)	5m 31s
Test TypeScript (ubuntu-latest, 3.x, functional)	4m 6s
Test TypeScript (macos-latest, 3.x, ts-unit)	4m 17s
Test TypeScript (macos-latest, 3.x, venv)	4m 46s
Test TypeScript (macos-latest, 3.x, single-workspace)	4m 3s
Test TypeScript (macos-latest, 3.x, debugger)	4m 27s
Test TypeScript (macos-latest, 3.x, functional)	3m 38s
Test TypeScript (macos-latest, 3.x, smoke)	3m 46s
Test TypeScript (windows-latest, 3.x, ts-unit)	11m 18s
Test TypeScript (windows-latest, 3.x, functional)	8m 31s
Smoke tests (ubuntu-latest, linux-x64)	1m 17s
	1h 33m 7s

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